These T-post hangers were designed to hang steel 'gong' targets from, but they can be used to hang anything from a T-post (like potted plants, for instance). They should be printed for strength. I used 9999 perimeters, no top or bottom layers, and 0.7mm thick perimeters/external perimeters extrusion width. They are strong enough for a 1/2" thick 12"x20" target with 4ft of 3/8" thick chain. Might be able to handle more but that's the largest/heaviest target I've got to try with them.